Elevator cut-out-valve attachment



(No Model.)

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A w S A. J. MGNICOLL. ELEVATOR CUT-DUT VALVE ATTACHMENT.

Patented July 9, 1895.

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' and claimed.

operator at all times.

UNITED 1 STATES PATENT OFFICE.

ANDREWJ. MONICOLL, OF SAN FRANCISCO, CALIFORNIA.

lELEv/rroa cur-ouT-VALVE ATTAoHn/i ENT.

SPECIFICATION forming part of Letters Patent No. 542,422.1, dated July 9, 1895.

Application nea December 3.1894. serrano. 530,732. camada.)

T'o'aZZ whom zit/'may concern:

Be it known that I, ANDREW J. MoNtcoLL, a citizen of the United-States, residing in the city and county of San Francisco, State of California, have invented an Improvement in Elevator Cut-Out-Valve Attachments; and I hereby declare the following to be a full, clear, and exact description of the same;

My invention relates to an attachment for elevators. f Y

It consists of the constructions and combinations of parts hereinafter fully described Referring to the accompanying drawings for a more complete explanation of my invention, Figure l-is a side elevation of an elevator-cylinder and connected parts, showing the application of my device. Fig. 2 isa plan view showing the supplementarycylinder. Fig. 3 is a section through this supplementary-cylinder, taken at right angles to Fig. 2. Fig. 4 is a longitudinalsection of the same. Fig. 5 is a detail of the weights.

A is a cylinder, shown in the present case as fixed in a horizontal position, having the plunger B, adapted to reciprocate therein, the plunger rod C, connecting with the cross-head or traveler D, which carries aseries of pulleys E, movable with it. At the opposite end of the cylinder are fixed corresponding pulleys F, and the elevator-rope'Ur passes around these sets of pulleys, there being as many pulleys as will be Vnecessary to multiply the motion ofthe rope sumciently to raise the elevator-cage to the desired height with the length of cylinder in-use. Water is admitted into the cylinder through a pipe H to move the plunger and raise the load, and its admis-v sion and escape are controlled byl any suitable form of valve, not here shown, these valves being usually actuated by means of a rope or'cord extending upward alongside the elevator-cage, so'as to be within reach of the If such a cord breaks, or it or the valve becomes disabled so that the valve cannot be closed when the piston approaches the end of the cylinder, there is danger of breaking the -machinery by reason of the piston being driven to the end of its stroke bythe full pressure of the water, thus causing it to strike the end of the cylinder,

-and if the cage be going up there is danger of it being carried beyond its highest point intothe sheaves at the top, which may cause adangerous accident by breaking the sus-- pending-rope or other parts. My invention is designed to prevent such accidents by automatically cutting off the water at each end of the stroke of the machine without reference to the operation of the manually-operated valve. As it cuts off automatically at each end of the stroke, Whether the manually-operated valve'acts or not, it always causes the mechanism to work smoothly.

In carrying out my invention I have here shown a cylinder or chamber I, the central portion of which has a transverse passage extending through it and connecting on one sidevwith the pipe II, which supplies the cylinder, and on the other side with the pipe leading from the source of supply 'and-the main valve, which is not here shown. A lining J2 tits the cylinder and is perforated to correspond with the passage H and valve-port.

The valve consists of two im perforate openended cylinders J J,`xed upon a valve-rod or stem K and slidable longitudinally within the casing J2, so as to leave an open Space between them equal in lengthV to the diameter of pipe'or passage I-I. When this valve is in its normal central position, this open space coincides with the passage H and the perforated portion of the lining J2, and when the main controlling-valve is opened Water flows `through the supply-pipe, the perforations in J2, and thepipe II to the cylinder. When the valve is moved so that either of its imperio-- rate ends coincides with the pipe H and the supply-pipe, the owrof Water is cut off; but the valve lits loosely enoughv to allow water to pass it slowly, when the main supply-valve is opened, so as to move the piston a little way in the cylinder to return the parts to their normal position, as will be hereinafter described.

I prefer to enlarge the cylinder I a little at its junction with the supply-pipeand the pipe I-l, as shown in Figs. 3 and 4, in order to allow the water to have free access to and escape from the perforated lining around nearly its whole circumference. Ribs l extend from the walls of this enlargement to the lining J2 on each side to prevent the water from passing around the outside of the lining.

IOO

Tho valve-rod K is connected with the valve, and is here shownas passing 4'throughstuifing-boxes at each end of the cylinder I. A rod K', forming an extension of the valve-rod,

is movable through suitable guides, and has fixed upon it the lugs or collars L.

M is an arm projecting from thecross-h'ead or traveler D, to which it is iixed, and having its end bored so as to tit lo'oselyupon the rod K', ,or otherwise so constructed as to move close to the rod, so that when the traveler hasnearly reached either end of its stroke this arm will strike the collar Lupon the rod and will thus move the rod, and with-itithe valve J J, so that the valve moving in the same direction with the traveler and cylinder-piston will be moved along `until theiperforate end weights N, having cords `or ropes `O passing over direction-pulleys P in line -abO-VeLhem, and these ropes `extend from the directionpulleys to a collar Q, which istixed totherod K between the pulleys P, sothatwhen .the valve Jand the rod KiK havefbeen moved in one direction, as previously described, to bring the closed portion J 1of the valve across the supp1y-opening, one ofthe weights Niwill be lifted by this action. p

The valve J J fits loosely -enough Lin -the cylinder to allow the water to pass 4it slowly when the main supply-valve is again -opened for the purpose of returning the pistonlinfthe hydrauliccylinder to either end, and the first movementlof the piston and Athe traveler D will carry the arm Mont ofcontact with the collar L, upon which itlacted to 'move the valve J and raise the weight N. Thisiallows the weight N, which was `raisedyto act `upon the rod K K and the valveJfJiso as to return the latter to its central lposition/thus bringing the port -in the valve into line with the supply-passage, which `is then in `condition to again supply water to the cylinder in the usual manner, or to allow `the water to escape when the cage is descending.

It will be manifest that `springs may be substituted -for weights with the same results, and yit is intended that the equivalent shall be understood wherever the'word weight is used. l

It will be seen that by this construction my cutoivalve oriplunger is -movcd in the same direction as the hydraulic cylinder-piston and cross-head are moving, and that the cut-off is produced by direct closure in either direction without any reverse mechanism.

The resetting device operates automatically, after the cut-off has done its work, to return it `to its central position with the port in line with "the supply-passage.

Having thus described my invention, what I claim as new, and desirelto secure by Letters Patent, is

"1. An elevator -cut out valve attachment, consisting of acylindrical valve chamber with closed ends andstuin g boxes for thepassage of la -valve rod, a `valve fixed to said rod and movable loosely in saidlchamber parallel with the main hydraulic cylinder, andcomprising cylindrical end portionsnormally open at both en dsfor lthelfree passage of .water-through the valve whereby -the yvalve islbalanced, and an intermediate port normallycorresponding in position with `the transverse passage made through the valve chamber and connecting the -maincylinder `with the source of supply and controlling valve, an extension of the valve rod having fixed collars and an arm fixedito the piston rod cross head adapted to' l strike=the collars and move the valve in the 'samedirection `withthepiston and without intermedi-ate levers, `and means connected with thevalvelrod for-returning the valve to its `normal position when the mainsupply valve is open.

`2. AAn Aelevator cut out `valve attachment, consisting ofravalvemoving loosely in a valve chamber `parallel with lthe main hydraulic cylinder and comprising cylindrical end portions normally-openrat both endsfor the free passage of waterthrough the valve `whereby the valve is balanced, and an vintermediate port normally corresponding-in positionwith the transverse .passage made through the valve chamberand connecting the main cylinder with the-source of `supplyandcontrolling valve,ia stemior rod connected with the valve and `means whereby it is actuated by the movement of the cylinder cross head.

In witness whereof I have hereunto set my hand.

ANDREW J. MCNIGOLL. TWitnesses:

S- H. Nonnen, H. F. Ascensori.

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